<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>WebSocket</title>
</head>
<body>
<input id="url" type="text" size="30" value="ws://localhost:18092/test/oneToOne/user1" />
<button onclick="openWebSocket()">打开WebSocket连接</button>

<br/><br/>
<textarea id="text" type="text"></textarea>
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>
</body>
<script type="text/javascript">
    var websocket = null;
    function openWebSocket() {
        var url = document.getElementById('url').value.trim();
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket(url);
        } else {
            alert('当前浏览器 Not support websocket')
        }
        //连接发生错误的回调方法
        websocket.onerror = function() {
            setMessageInnerHTML("WebSocket连接发生错误");
        };
        //连接成功建立的回调方法
        websocket.onopen = function() {
            setMessageInnerHTML("WebSocket连接成功");
        }
        //接收到消息的回调方法
        websocket.onmessage = function(event) {
            setMessageInnerHTML(event.data);
        }
        //连接关闭的回调方法
        websocket.onclose = function() {
            setMessageInnerHTML("WebSocket连接关闭");
        }
    }
    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function() {
        closeWebSocket();
    }
    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }
    //关闭WebSocket连接
    function closeWebSocket() {
        websocket.close();
    }
    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>